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Tyrannosaurus rex was bipedal with a large head, tiny forelimbs and a long tail. Adults ranged from around 9.1-15.2 meters long with legs up to three meter long, and weighed in excess of five tons. They had yellow eyes, a strong sense of smell and a loud, gutteral roar. (TOSnovel: First Frontier)

An Enterpriselanding party encountered a Tyrannosaurus rex family during a mission to prehistoric Earth. The largest Tyrannosaur attacked a titanosaur, severely wounding it but was injured itself and couldn't immediately chase the fleeing sauropod. Instead, it used its powerful sense of smell to track the titanosaur shortly afterwards, followed by a smaller adult tyrannosaur and a young one. (TOSnovel: First Frontier)